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Pale Twin-leaf

Zygophyllum Glaucum


Annual herb or perennial sub-shrub up to 20 cm tall, often forms a mat up to 2 m in diameter. Pale four-petalled yellow flowers. 

Young plants initially have large bronze coloured foliage, but as the plants mature the leaves reduce in size and change to green. Depending on environmental conditions, plants can be annual or perennial. Growth is usually low and spreading but shrubs can grow up to 40cm. 

Leaves: Distinctive leaves made up of two fleshy Y-shaped leaflets looking like butterfly wings. Leaves are ovate with a narrow end at their base. Leaves grow between 1-4cm long and are fleshy, a dull grey-green or green. 

Flowers: Bright yellow in colour with four petals growing between 8-15 mm. 

Fruits/seeds: Fleshy seed capsules which are ovoid-oblong shape with 4 angled edges. 


What to Observe

  • First fully open single flower 
  • Full flowering (record all days)
  • End of flowering (when 95% of the flowers have faded)
  • No flowering
  • Fruits/seeds (record all days)

ClimateWatch Science Advisor

We expect plants to start shooting and flowering earlier in the year as a result of climate change warming the Earth. They may also start appearing in new areas, as warmer temperatures enable them to live in environments that were previously too cold for them. Help scientists answer the question: "How are our animals, plants and ecosystems responding to climate change?"

When To Look

Flowering occurs May-December

Note: ClimateWatch is looking for any changes in the timing of these events so remember to keep a lookout all year!


Where To Look

Grows on a variety of soils, predominantly loamy sands, often in mallee communities; widespread west of the Great Divide. Also in SE Queensland, NW Victoria, South Australia, southern Northern Territory and southern Western Australia.

Note: ClimateWatch is looking for any changes outside of their known ranges so remember to keep a lookout beyond these regions too!



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